"I, Michael Buesch, am one of the maintainers of the GPL'd Linux
wireless LAN driver for the Broadcom chip (bcm43xx). The Copyright holders of bcm43xx (which includes me) want to talk to you, OpenBSD bcw developers, about possible GPL license and therefore copyright violations in your bcw driver. We believe that you might have directly copied code out of bcm43xx (licensed under GPL v2), without our explicit permission, into bcw (licensed under BSD license)." The entire thread can be found here.